AJAX is a soccer club in the dutch league. 
You might have heard a thousand times that big websites like gmail or live mail uses AJAX technology. You might think its a component like flash or java applet. Infact its about 5 lines of javascript. So, lets reduce it’s name from AJAX technology to AJAX technique.
HINT: Do you know about HTML inline frames , if you have ever used an inline frame on your webpage, your are one step ahead to understand the core concept of AJAX technique.
If you don’t know about dynamic web pages and server sided scripts like PHP, you will not understand what AJAX means, an article is soon coming for this.
Main concept (You can start reading here):
The power of AJAX is unbelievable, let me show you an example.
Imagine that you are writing a simple file manager script. While loading, the files are listed on the web page like this:
Our first objective here is to ’send delete command to the server’ without reloading the web page like ‘filemanager.php?action=delete&file=myfile.zip’ or loading other pages, when user clicks on ‘Delete’.
The second objective is to remove the deleted file from the list without refreshing the whole web page.
Right! you guessed it, JavaScript!
A perfect synchronizations of all the actions are vital in such application:
- The command must reach the server without refreshing our web page.
- Following that, our web page must wait for the server’s response.
- Based on the server’s response, the web page must refresh only a part of it that requires updating and also display an appropriate status message.
And with AJAX, its possible!
What is PHP? lol